Effective protect of oxygen vacancies in carbon layer coated black TiO2−x/CNNS hetero-junction photocatalyst

Liu, Chang; Wu, Pengcheng; Wu, Jianning; Hou, Juan; Bai, Hongcun; Li, Yong

doi:10.1016/j.cej.2018.11.117

Cited by 65 publications

(22 citation statements)

References 52 publications

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“…Although special efforts are being made to synthesize noble-metal free nanocomposites, there is still widespread use of Pt as a co-catalyst in H 2 evolution reactions. Except for the already mentioned TiO 2−x /CNNS photocatalyst [84], TiO 2 /g-C 3 N 4 composites with the use of photodeposited Pt as co-catalyst reached HER of 4128 µmol/h/g [87] and 1041 µmol/h/g [83] under solar and visible light irradiation, respectively. Pan et al [88] also exhibited a high HER of 13800 µmol/h/m 2 by the use of Pt as a co-catalyst with g-C 3 N 4 /TiO 2 nanofilm.…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 90%

“…Graphitic carbon nitride (g-C 3 N 4 ), a two-dimensional, metal-free polymeric π-conjugated semiconductor material, which has attracted a lot of attention [83][84][85][86][87][88][89][90][91] since the pioneering work of Wang et al [92] in 2009, due to its high stability, visible light response with the bandgap of 2.7 eV and non-toxicity [93], thus representing a viable candidate to be applied in photocatalytic water treatment [80], has certainly been one of the most investigated photocatalysts inside carbon-based nanomaterials. It can be easily synthesized through the direct pyrolysis of nitrogen-rich precursors, such as melamine, cyanamide, dicyandiamide, and urea, but its practical application and principle drawback is low specific surface area and high rate of electron-hole recombination [83,94,95].…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

“…The advantages and limitations of g-C 3 N 4 are already mentioned above in the case of water treatment. The limitations referring to low light utilization efficiency and insufficient surface area can be easily broken by the preparation of 2D nanomaterials, especially g-C 3 N 4 nanosheets (CNNS) [84]. The self-assembly method of construction 2D/2D TiO 2 /CNNS heterojunction composites achieved a hydrogen evolution rate (HER) of 350 µmol/h/g under visible light, in comparison with the produced H 2 with the use of pure TiO 2 nanosheets (20 µmol/h/g) and g-C 3 N 4 nanosheets (130 µmol/h/g) [85].…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

“…Liu et al recorded another use of CNNS [84], who synthesized partially reduced TiO 2−x through NaBH 4 treatments with the formation of an additional mid-gap band state (Ti 3+ and oxygen vacancies-O vs ) to extend absorption edge. The implementation of novel design tactic in the form of a protective carbon layer that was coated onto TiO 2−x /CNNS hetero-junction photocatalyst enhanced the photocatalytic efficiency.…”

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

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Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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Clean water and the increased use of renewable energy are considered to be two of the main goals in the effort to achieve a sustainable living environment. The fulfillment of these goals may include the use of solar-driven photocatalytic processes that are found to be quite effective in water purification, as well as hydrogen generation. H2 production by water splitting and photocatalytic degradation of organic pollutants in water both rely on the formation of electron/hole (e−/h+) pairs at a semiconducting material upon its excitation by light with sufficient photon energy. Most of the photocatalytic studies involve the use of TiO2 and well-suited model compounds, either as sacrificial agents or pollutants. However, the wider application of this technology requires the harvesting of a broader spectrum of solar irradiation and the suppression of the recombination of photogenerated charge carriers. These limitations can be overcome by the use of different strategies, among which the focus is put on the creation of heterojunctions with another narrow bandgap semiconductor, which can provide high response in the visible light region. In this review paper, we report the most recent advances in the application of TiO2 based heterojunction (semiconductor-semiconductor) composites for photocatalytic water treatment and water splitting. This review article is subdivided into two major parts, namely Photocatalytic water treatment and Photocatalytic water splitting, to give a thorough examination of all achieved progress. The first part provides an overview on photocatalytic degradation mechanism principles, followed by the most recent applications for photocatalytic degradation and mineralization of contaminants of emerging concern (CEC), such as pharmaceuticals and pesticides with a critical insight into removal mechanism, while the second part focuses on fabrication of TiO2-based heterojunctions with carbon-based materials, transition metal oxides, transition metal chalcogenides, and multiple composites that were made of three or more semiconductor materials for photocatalytic water splitting.

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Section: Tio 2 /G-c 3 Nmentioning

confidence: 90%

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

Section: Tio 2 /G-c 3 Nmentioning

confidence: 99%

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Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

et al. 2020

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“…The above results clearly demonstrate that the TiO2-B nanoplate surfaces are coated by SnS2 and the interface heterojunction forms between TiO2-B and SnS2. The tight heterojunction structure of SnS2/TiO2-B would benefit the interfacial charge transfer spatially, and thereby increase the photocatalytic activity [35]. Figure 4a shows the typical TEM images of SnS 2 /TiO 2 -B.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Ti3+ Defective SnS2/TiO2 Heterojunction Photocatalyst for Visible-Light Driven Reduction of CO2 to CO with High Selectivity

et al. 2019

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In recent years, defective TiO2-based composite nanomaterials have received much attention in the field of photocatalysis. In this work, TiB2 was used as a precursor to successfully prepare Ti3+ defective TiO2 (TiO2-B) with a truncated bipyramidal structure by a one-step method. Then, the SnS2 nanosheets were assembled onto the as-prepared TiO2-B through simple hydrothermal reaction. TiO2-B exhibits strong visible light absorption properties, but the recombination rate of the photo-generated electron-hole pair was high and does not exhibit ideal photocatalytic performance. Upon introducing SnS2, the heterojunction catalyst SnS2-Ti3+ defective TiO2 (SnS2/TiO2-B) not only possesses the strong light absorption from UV to visible light region, the lowest photo-generated charge recombination rate but also achieves a more negative conduction band potential than the reduction potential of CO2 to CO, and thereby, exhibits the significantly enhanced selectivity and yield of CO in photocatalytic CO2 reduction. Notably, SnS2/TiO2-B produces CO at a rate of 58 µmol·h−1·g−1 with CO selectivity of 96.3% under visible light irradiation, which is 2 and 19 times greater than those of alone TiO2-B and SnS2, respectively. Finally, a plausible photocatalytic mechanism on SnS2/TiO2-B was proposed that the electron transfer between TiO2 and SnS2 follows the Z-scheme mode. Our results present an effective way to gain highly efficient TiO2 based photocatalysts for CO2 reduction by combining different modification methods of TiO2 and make full use of the synergistic effects.

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Surface Functionalization and Defect Construction of SnO₂ with Amine Group for Enhanced Visible‐Light‐Driven Photocatalytic CO₂ Reduction

Huo,

Zhang,

Chi

et al. 2024

Advanced Energy Materials

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Photocatalytic CO2 reduction to hydrocarbon fuels through solar energy provides a feasible channel for reducing CO2 emission and resource depletion. Nevertheless, severe charge recombination and high energy barrier limit the CO2 reduction efficiency. Herein, a surface amine‐functionalized SnO2 with oxygen vacancies (A‐Vo‐SnO2) is fabricated to achieve visible‐light‐driven photocatalytic CO2 reduction. Specifically, amino groups modified onto the surface of the catalyst can provide more active sites to promote the adsorption of CO2. Meanwhile, the synchronously induced oxygen defect level reduces the band‐gap energy and expands the light‐absorption region from UV light to visible light. The oxygen vacancies can modulate the electronic structure and work as the separation centers of spatial charges, thus promoting the interfacial charge transfer efficiency and providing more catalytic sites, as evidenced by experimental observation and theoretical calculation. As expected, this A‐Vo‐SnO2 exhibits a CH4 evolution rate of 17.27 µmol g−1 h−1 without adding sacrificial agent and co‐catalyst, much higher than 5.98 µmol g−1 h−1 of pure SnO2. This work can provide significant inspiration for the design of defect engineering based on visible‐light‐driven photocatalysts towards photocatalytic CO2 conversion.

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Effective protect of oxygen vacancies in carbon layer coated black TiO2−x/CNNS hetero-junction photocatalyst

Cited by 65 publications

References 52 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Ti3+ Defective SnS2/TiO2 Heterojunction Photocatalyst for Visible-Light Driven Reduction of CO2 to CO with High Selectivity

Surface Functionalization and Defect Construction of SnO₂ with Amine Group for Enhanced Visible‐Light‐Driven Photocatalytic CO₂ Reduction

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Effective protect of oxygen vacancies in carbon layer coated black TiO2−x/CNNS hetero-junction photocatalyst

Cited by 65 publications

References 52 publications

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Recent Achievements in Development of TiO2-Based Composite Photocatalytic Materials for Solar Driven Water Purification and Water Splitting

Ti3+ Defective SnS2/TiO2 Heterojunction Photocatalyst for Visible-Light Driven Reduction of CO2 to CO with High Selectivity

Surface Functionalization and Defect Construction of SnO2 with Amine Group for Enhanced Visible‐Light‐Driven Photocatalytic CO2 Reduction

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Product

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About

Surface Functionalization and Defect Construction of SnO₂ with Amine Group for Enhanced Visible‐Light‐Driven Photocatalytic CO₂ Reduction